Nanosecond Pulsed Laser Ablation on Stainless Steel − Combining Finite Element Modeling and Experimental Work

2019 ◽  
Vol 21 (8) ◽  
pp. 1900193 ◽  
Author(s):  
Jun‐Jie Zhang ◽  
Liang Zhao ◽  
Andreas Rosenkranz ◽  
Cheng‐Wei Song ◽  
Yong‐Da Yan ◽  
...  
Keyword(s):  
Finite Element ◽  
Stainless Steel ◽  
Laser Ablation ◽  
Finite Element Modeling ◽  
Experimental Work ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Element Modeling ◽  
Nanosecond Pulsed Laser

Finite element analysis of nanosecond pulsed laser ablation of various materials

2017 ◽  
Vol 14 (6) ◽  
pp. 489-496 ◽  
Author(s):  
Jifeng Ren ◽  
Rajib Ahmed ◽  
Haider Butt
Keyword(s):  
Finite Element ◽  
Laser Ablation ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Metallic Materials ◽  
The Finite Element Method ◽  
Element Analysis ◽  
Content Type ◽  
Fem Method ◽  
Nanosecond Pulsed Laser

Purpose The purpose of this paper is to analyse nanosecond pulsed laser ablation on both metallic materials and non-metallic materials; a comparison between metallic materials and non-metallic materials has also been included. Design/methodology/approach In this paper, FEM method has been used to calculate the result by means of the finite element method. Furthermore, all the analyses are based on thermal theories. Findings The paper presents a comparison of metallic and non-metallic materials. Besides, the effect of how laser parameter changes would influence the ablation depth has also been assessed. Research limitations/implications All studies in this paper are based on classical thermal theories. Thermal theories are not applicable some times. Originality/value With the results of this paper, suggestions are made so that experiments and manufactures could be optimised and improved.

Nanosecond pulsed laser ablation of silicon—finite element simulation and experimental validation

2019 ◽  
Vol 29 (7) ◽  
pp. 075009 ◽  
Author(s):  
Junjie Zhang ◽  
Liang Zhao ◽  
Andreas Rosenkranz ◽  
Chengwei Song ◽  
Yongda Yan ◽  
...  
Keyword(s):  
Finite Element ◽  
Laser Ablation ◽  
Finite Element Simulation ◽  
Experimental Validation ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Nanosecond Pulsed Laser ◽  
Element Simulation

scholarly journals Finite Element Modeling of Residual Stress at Joint Interface of Titanium Alloy and 17-4PH Stainless Steel

Metals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 629
Author(s):  
Nana Kwabena Adomako ◽  
Sung Hoon Kim ◽  
Ji Hong Yoon ◽  
Se-Hwan Lee ◽  
Jeoung Han Kim
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Stainless Steel ◽  
Finite Element Modeling ◽  
Equivalent Stress ◽  
Stress Gradient ◽  
Joint Interface ◽  
Element Modeling ◽  
Actual Experiment ◽  
Maximum Equivalent Stress

Residual stress is a crucial element in determining the integrity of parts and lifetime of additively manufactured structures. In stainless steel and Ti-6Al-4V fabricated joints, residual stress causes cracking and delamination of the brittle intermetallic joint interface. Knowledge of the degree of residual stress at the joint interface is, therefore, important; however, the available information is limited owing to the joint’s brittle nature and its high failure susceptibility. In this study, the residual stress distribution during the deposition of 17-4PH stainless steel on Ti-6Al-4V alloy was predicted using Simufact additive software based on the finite element modeling technique. A sharp stress gradient was revealed at the joint interface, with compressive stress on the Ti-6Al-4V side and tensile stress on the 17-4PH side. This distribution is attributed to the large difference in the coefficients of thermal expansion of the two metals. The 17-4PH side exhibited maximum equivalent stress of 500 MPa, which was twice that of the Ti-6Al-4V side (240 MPa). This showed good correlation with the thermal residual stress calculations of the alloys. The thermal history predicted via simulation at the joint interface was within the temperature range of 368–477 °C and was highly congruent with that obtained in the actual experiment, approximately 300–450 °C. In the actual experiment, joint delamination occurred, ascribable to the residual stress accumulation and multiple additive manufacturing (AM) thermal cycles on the brittle FeTi and Fe2Ti intermetallic joint interface. The build deflected to the side at an angle of 0.708° after the simulation. This study could serve as a valid reference for engineers to understand the residual stress development in 17-4PH and Ti-6Al-4V joints fabricated with AM.

Growth of highly oriented graphite by ultraviolet nanosecond pulsed laser ablation of monocrystalline diamond

2021 ◽  
pp. 151995
Author(s):  
Liang Zhao ◽  
Chengwei Song ◽  
Junjie Zhang ◽  
Yandi Huang ◽  
Chunyu Zhang ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Nanosecond Pulsed Laser ◽  
Monocrystalline Diamond
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